Improvement in machines foe bending wood



Jmmfmvm/mpm www@ 5mm @frm PATENTED uitrit tutes @anni @fitta JOSEPHKLAHB, OF BERNVILLE, ASSIGNOR TO HIMSELF, W. R. WEAND, C. I-I. ZINK, AND

JAMES J. WAGENHORST, OF PHILADELPHIA, PENNSYLVANIA.

Letters Patent No. 71,886, dated December 10, 1867.

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Be it known that I, JOSEPH KLAHR, of Bernville, Berks county, Pennsylvania, have invented anApparatus i for Bending Strips of Wood; and I do hereby declare the following to be a full, clear, and exact description of the same. 4

My invention consistsofvcert'an devices, fully described hereafter, for bending strips of wood, and for retaining them in their bent position until they have permanently acquired the desired shape.

In order to enable others skilled in the art to make and use myinvention, I will now proceed to describe its construction and operation, reference being had to' the accompanying drawing, which forms a part of this i specification, and in which- I K Figure 1 is a sectional elevationfof my apparatus for bending strips of wood.

Figure 2, a side elevation. 4

Figure 3, a transverse vertical section, on the line 1-2, iig. 1.

Figure 4, the same, on the line 3 4, lig. 1; and

Figure 5 a sectional perspective view of a portion of the apparatus.

Similarletters refer to similar parts throughout the several views.

The frame of the apparatus consists of a bar, A, supported by legs d, the said bar being thicker at the centre than at the ends, and at each end and on opposite sides of 'the bar are two adjustable plates, B and B', secured by bolts or otherwise, and having on their upper edges shoulders c, for a purpose described hereafter.

YA strip, C, of thin iiexible steel, rests upon the upper surface of the bar A,a1id is retained i n its place by the plates B B', which enter recesses cut in the edge Opf-the strip. Toprojections, on the under surfaccof the bar A, are hung weighted levers D D', from the opposite sides of each of which'project pins e. The strips of wood dto be bent are placed upon the ilexible plate C, and the latter, ,with the4 strips, is passed through a' yoke or` frame, E, which is let into a, recess in the bar A, as shown in fig. 4, the strips and plate being clamped betweenthe lower side of the frame, and a plate, g, upon the upper side of `which bears a set-screw, h, turning in the upper side of the frame. An L-shaped former, F, rests upon the strips d, near'to'one end of the bar A, a projection, z', aitV each side of the former, bearing'l against one of the'shoulders c of each of the plates B and B', and thus determining lthe position of the block.4 A yoke or clamp, G, passes around a projecting arm, p, of th former F, around the strips d, and around an enlargement on the end of the plate C, and the `whole are rmly bound togetheriby a. set-screw, j, which turns in the yoke andbears on the former, as shown in figs; 1 and 3. The end of an arm, 7c, Jrits a socket in the former F, and the ends of a link, Z, which passes around an arm, p', of the former, are hooked to the pins e of the weighted lever D. At the opposite end of the apparatus is a similar former, F', also secured to the strips and plate C, is linked to the weighted lever D', and is pro vided with an arm, c'.

After the several parts have been thus secured together, the arms k and 7c' are `simultaneously turned towards each other, thus bending the strips and plate C around the formers F and F', as shown in iig. 2, the weighted levers D and D', through the tn ,cdium of tho links l, holding down the arm-spp of the farmers, and maintain* ing the parts of the strpsand platos between the two formers in close contact with the bar A. When the strips are bent, tho arms 7c and 7c' cross each other, as lshownin fig. 2, and are prevented from springing back, either by means of adjustable catches q, secured to each arm, or by a, nut, r', on a rod, u, connected to the yoke E,- us shown in iig. 2. The links Zarc now unhooked from the levers D and D', and are detached from the formera, after which cach lover may be raiscdfand attached to the bar A by means of a hook,f, which enters a staple on the lever. The farmers F and F', yoke E, plate C, and the bent strips, may then be removcdfrom the frame y of the apparatus, the parts retaining the position they occupied while on tho frame. `'lhc strips are retained in contact with the formc'rs until they have permanently acquired tho shape to which they havo been bent.` The outer ends of the strips are then connected together by cross-pieces in the usual manner, after which tho set- 'serews jj and r, are loosened, and the several parts are removed from the bent strips, and are returned to the frame of the apparatus, t'o be used in bending another sot of strips, as before described.` By raising or lowering the adjustable plates B B' so as to bring different shoulders c in a position to be struck by the projections i, the position ofthe formare F and 1'" may bo so regulated that frames of any desired width may ho formed.

In making framesy for wagon-covers, &e., of thin strips of wood, it has been customary lto bend the latter around a forni, in doing whieh, owing to the unequal vstrain exerted upon the strips,'nearly half of the strips arelbrfoken. In my 'apparatus the strips are supported when the bending begins by the ilexibleyplate C, which presses the strips against the farmers F and F', so that they cannot be bent so abruptly as to be broken. v have found by actual experiment that when strips of well-conditioned Awoolliare submitted 'to the above operation, ire'ry few, if any, are broken, 'and that frames of any desired size, and of'a regular, even shape, can be made at about half the usual expense. y

lAlthough I have alluded to four strips of wood as being operated on'at one time, itv should be understood that any number oi' strips that can be ,conveniently packed together within the apparatus may be bent simultaneously.

I claim as my invention, and desi-re to secure' by Letters Patent- Y 1. The formers F F', with their arms'pp', levers c c', and catches q, or their equivalents, in combination with the clamps G, the whole being constructed and operating substantially as andl for the purpose described.

2. The' combination of. the above, the weighted levers D D', and the links Z.

3. The adjustable plates B Bv', with their shoulders c, operating in combination with the formers and their projections q, substantially as and forthe purpose described.

In testimony whereof, Iliave signed my name to this specification in the presence of two subscribing witnesses.

JOSEPH KIAHR.

Vi'litnesses:4 H. W. P. L. SCHELLHAMMER, SAMUEL M. 

